Sectional repair bag and method of making the same



June 3, 1930. c. H. DEsAUTELs 1,750,897

SECTICNAL REPAIR BAG AND lMETHOD 0F MAKING THE SAME Filed March 30, 1927 INVENToR. Y /f /ZQMM ATTO Patented June 3, 1930' UNITED STATES yPATENT OFFICE CHARLES H. vIDESAUTELS, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR T THE FISK RUBBER COMPANY, OF CHICOPEE FALLS,

MASSACHUSETTS MASSACHUSETTS, A. CORPORATION OF SECTIONAL REPAIR BAG AND METHOD OF- MAKING THE SAME Application led March 30, 1927. Serial N'o. 179,455.

This invention relates to improvements in sectional repair bags and methods of making the same and has particular-reference to an improvement on the repair bag described in my co-p'ending application Serial No. 173,347, filed March 7, 1927. It has for a particular object the production of a bag of the general character described in my co-pending ap' plication, but in which the bag fits the interlo nal contour of the tire casing and in which the rod or other member which prevents longitudinal expansion of the bag is straight instead of curved. The general object is to produce a bagwhich will be permanent in its length and longitudinal curvature and which will fit the inside of the casing so as to give a uniform pressure throughout the interior surface of the tire.

Referring to the drawings, b Fig. 1 is a side elevation of my improved Fig. 2 is a longitudinal section therethrough; A

Fig. 3 is a transverse section on line 3 3 of Fig. 2;

Fig. 4 is a fragmentary section showing the bag in process of construction; and

Fig. 5 is a section on line 5-5 of Fig. 4. The bag is formed with a body portion 10 having an annular chamber 11 therein, into which fluid pressure may be introduced for the purpose of expanding the bag during use. This chamber is defined by outer wall 12 and inner wall 18, through which is formed a y hole 14, and by end walls 15 set approximately radial to the longitudinal curvature of the bag. A rod 16 extends through the central hole 14 from one end of the bag to the other. A't each end of the bag are end plates 17 having-hole 18 made therethrough at an angle, the rod 16 extending through the hole and being secured in position by nuts 19 which' bear against angular bosses 20 formed on the plates. "In order to allow the bag to be pulled out `of a tire, a washer 21 is secured under one of the nuts 14,' a handle 22 being looped through a hole in the washer. A valve stem 23 opens into the annular chamber 11 to afford means for introducing Huid pressure.

The bag, as will be seen from Figs. 1 and 2, is given a longitudinal curve corresponding to the curve of the tire casing, and has a transverse form corresponding to the horseshoe shape of the interior of the tire casing.

The hole 14, however, is straight or substanthrough repeated beatings, the nuts may be removed, the end plates 17 `and the rod 16 taken from the rubber bag, and a new rubber bag substituted. My present bag has, however, the advantage over the previous one, that there is no tendency for the central rod to become deformed on repeated use and the bag better fits the inside shape of the tire casing.

In making the' bag, plies 25, 26, and 27, of which 25 is the largest. are built up upon a mandrel 28 preferably slightly larger than the rod 16. Plies 29 are formed into a tube upon a large mandrel, and their ends cutl on a bevel as indicated in Fig. 4. This tube is then removed and fastened to the plies 25, 26, and 27 by end plies 30, these latter being set on a slant. A reinforcement of fabric 81 is then placed around the corners -at the end ofthe bag as shown in Fig. 4. v

yone anda half times around in such a manner as to give an extra thickness at the outercircumference ofthe bag. End plies 33 are now added, it being understood that the valve stem 23 is suitably held in place in the common manner and is vented to the interior chamber 11. If desired, corner reinforcements 34 can be applied between the plies 27 and the end plies 30.

The bag thus constructed is vulcanized in any suitable mold which can be of the usual form common in the manufacture of sectional repair bags. The mandrel 28 is held in suitable bearings in the moldhand the outer wall 12 is shaped from the original cylindrical form of Fig. 4 to the longitudinal curve of Fig. 2. The ends of the bag being,

annular fluid receivingchamber is provided around a hole extending in a stralght line radial. v v

CHARLES H. DE SAUTELS.

however, originally built on a slant, do not require much distortion of the body of the bag. During vulcanization the bag is inflated by fluid pressure` applied through the valve stem 23, in order to force it thoroughly against the mold walls. After vulcanization has been completed the mandrel 28 is withdrawn and the rubber bag assembled with the end plates 17, the rod 16, and the nuts 19.

From a comparison `ot Figs. 2 and 3, itl

will be seen that the transverse sectional shape of the bag gives space permitting the inner tubular wall 13 to run straight from one end of the bag to the other. Were the shape of the bag circular in cross section, rather than in the general form of a horseshoe as shown in Fig. 3, the inner portion of wall 12 would interfere with the straightness of the tubular wall 13. For this reason it is desirable to combine the features of the straight rod 16 with the horse-shoe cross vsection of the bag, shown best in Fig. 3.

Having thus described my invention, I claim:

1. A sectional repair bag composed of a rubber body portion longitudinally curved to fit a tire casing and formed transversely to a horse-shoe shape corresponding to the shape' of the interior of the tire, said body portion being formed with integral walls defining a fluid tight annular chamber and a straight hole extending through the center of the annulus from one end of the body portion to the other, and plates lying against the ends of the body portion and having holes therein in register with the hole through the body portion, and a straight rod extending through the several holes and secured to the end plates, whereby the bag is secured against longitudinal expansion.

2. A sectional repair bag adapted to be used with external metal end plates joined by a straight connecting rod, comprising a tube shaped to the curvature of the tire both longitudinally and transversely, a smaller rod-receiving tube passing in an approximately straight line through the curved tube, and end walls extending approximately radial to the longitudinal curvature ofthe bag and joining the two tubeswhereby an' ,so I 

